tests/e2e: fix metrics tests

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>

tests/e2e/metrics_test.go

@@ -39,7 +39,6 @@ func metricsTest(cx ctlCtx) {
 	if err := ctlV3Put(cx, "k", "v", ""); err != nil {
 		cx.t.Fatal(err)
 	}
-	ver := version.Version
 
 	i := 0
 	for _, test := range []struct {
@@ -49,7 +48,7 @@ func metricsTest(cx ctlCtx) {
 		{"/metrics", fmt.Sprintf("etcd_debugging_mvcc_keys_total 1")},
 		{"/metrics", fmt.Sprintf("etcd_mvcc_delete_total 3")},
 		{"/metrics", fmt.Sprintf(`etcd_server_version{server_version="%s"} 1`, version.Version)},
-		{"/metrics", fmt.Sprintf(`etcd_cluster_version{cluster_version="%s"} 1`, ver)},
+		{"/metrics", fmt.Sprintf(`etcd_cluster_version{cluster_version="%s"} 1`, version.Cluster(version.Version)+".0")},
 		{"/health", `{"health":"true"}`},
 	} {
 		i++